[LimeSDR-USB] Tx Calibration: MCU error 5 (Loopback signal weak: not connected/insufficient gain?)

I am able to capture data from Rx, but when I use Tx, I got
Tx Calibration: MCU error 5 (Loopback signal weak: not connected/insufficient gain?)
Tried almost all solutions on the forum but the problem still cannot be solved, could someone help me fix it? Thanks!
my software version is 18.06.1-PothosSDR-2018.09.09-vc14-x64 (latest version)

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